Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.cej.2014.03.049
Title: Thin film composite forward-osmosis membranes with enhanced internal osmotic pressure for internal concentration polarization reduction
Authors: Zhou, Z.
Lee, J.Y. 
Chung, T.-S. 
Keywords: Concentration polarization
Desalination
Forward osmosis
Sulfonated polymeric membrane
Water purification
Issue Date: 1-Aug-2014
Citation: Zhou, Z., Lee, J.Y., Chung, T.-S. (2014-08-01). Thin film composite forward-osmosis membranes with enhanced internal osmotic pressure for internal concentration polarization reduction. Chemical Engineering Journal 249 : 236-245. ScholarBank@NUS Repository. https://doi.org/10.1016/j.cej.2014.03.049
Abstract: Thin-film composite (TFC) forward-osmosis (FO) membranes with enhanced internal osmotic pressure (IOP) were used to reduce internal concentration polarization in this study. These TFC membranes contained a selective polyamide layer deposited by interfacial polymerization on a support substrate cast from a polymer blend of polysulfone (PSf) and sulfonated poly(phenylene oxide) (SPPO). The immobilized counter ions (Na+) in SPPO gave rise to an IOP which facilitated water transport in the AL-FS operating mode (i.e., the active layer is facing the feed solution, also referred to as the FO mode) but retarded water transport in the AL-DS operating mode (i.e., the active layer is facing the draw solution, also called as the pressure retarded osmosis (PRO) mode). An optimized TFC membrane could draw a water flux of 39 LMH (Lm-2h-1) in the AL-FS mode, which is among the highest in the current literature; and 57 LMH in the AL-DS mode, which is comparable to other published works using deionized water as the feed and 2M NaCl as the draw solution. The optimized SPPO/PSf TFC membrane also outperformed other published FO membranes in simulated seawater desalination. Extremely high water fluxes of 25 and 19 LMH could be obtained in the AL-DS and AL-FS modes respectively. The impressive high water flux in the AL-FS mode makes this membrane particularly suitable for FO operations where internal concentration polarization (ICP) and membrane fouling are major concerns. © 2014 Elsevier B.V.
Source Title: Chemical Engineering Journal
URI: http://scholarbank.nus.edu.sg/handle/10635/90393
ISSN: 13858947
DOI: 10.1016/j.cej.2014.03.049
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